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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcf91575ddfd128d8589025c29415bac1dbe6a3b66b27e58b94644156051ca1' 
  AND token = '2eb6rhTmCTDrZl1jkaFtXxMomhiAi2uU/TvQ6IgawJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}