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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95371f244d36062bb12aeef5f3f2d2674e4bafc2b6aed47ff36a92a1bbd04da0' 
  AND token = 'X/99roRYzoXgNlSj7OsAldXKhmlQOBbDwYS2FLsb31U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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