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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2e57a60ce501774e6ec6ed7fa96a81bd77389ecace893e7597d0091d7abbc6' 
  AND token = 'dTrnOVQ+oakZCikpVjhAUK4bSD9TyVg8eWx9u3vwXCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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