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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6377ed0faf0490bc6ddf71daeec2699251b68de5c6fd0005dade7de39ae3b03e' 
  AND token = 'wegIN+kwEbIBXg5RbApaE64naBzz8G8m/UVr+LtodTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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