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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1d46ae7492ab2bfbd0af86686cc07039003039b2301812a769e7f3a702a1f8' 
  AND token = '7F5afitQYNNCza5Je0+8PYS3Xvi0Su2WgLi/LPAjLu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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