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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018a3ee661f60940fc09695e70b9447959f3c56fcc109e071729aeba97ddd170' 
  AND token = 'wTyq3+oDhHIOfRrzv4xMBpp67o0POnSf9+VsOEKsMqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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