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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c385994ada4293b37e89ddbadff4a7775abd769d7395de7b60ae07596d11bbd' 
  AND token = 'QZW4PK0w/FmFqYrBQ9CzrfkadxSXl3th/n3fLll7x8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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