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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0776a0d24f684c954195ae77de4940238e183eb602d6ed1d8961067d6e96c0e8' 
  AND token = 'ruxLq9eJWm4mtsG1FntgXvpz96etNOIrmt1WBYajz58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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