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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af38651d2b2e82619ae874d8f75288df66f976e9d25e6a4eaaa64ac61c2c4e5a' 
  AND token = 'f8RhEuuo956g14A7oMj7WudKwUXADaaRc6Zc0thlpkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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