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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebfb6d470790642f052a4d62a2bac332fb503841ed1874b7548ba11430792a2' 
  AND token = 'd1qBAEuo3SLoHhPgLI8CrxIJmP/aOS0g9wATH8seVj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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