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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1174f58a4c501a4e646d5a34b392db5c6c8632f54d5e48bf51ad38e51b15021b' 
  AND token = 'GCi0dGBvEAcd3PB1jEGbmrTnCTX5aRBkJtlq0GnC89M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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