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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37fe855f2de71e531faf5e09501f7cf50cdf3a92956ea9eef70c182f79f50954' 
  AND token = 'Ufn9QQ1dj3U1KT1PfHUSScR+ydkBD5L6HrsRIHuYCa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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