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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67481ed63be4cbeb1b68fbb4b2f4b0f42bbaa1a9bb12dbe7cd4cd68ae8c50c3a' 
  AND token = 'xxo+g9SQLKaGpZPCB5vdUfiPWU6StRG9hL6uYnFh5ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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