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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5403f163cb791f911ac8628f05bd94c6053b8401595ed8221fe0cc6f0c87ede4' 
  AND token = 'V+fb8ez9g4SGzoehB40zWgMwzptQViC2zP85Pu7Jo9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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