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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ed6427f96f625360118c7827f23014a99b63a974808cd12c46bfa3a22a983c' 
  AND token = '08CYCMrpY3v9K5GZPKvmKmkrmu1QtxNgu7NNbfru1T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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