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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a7a7b02c9a1ba2d0b12da01f325893f1e62686dc71acdd9444486d33d07e18' 
  AND token = 'UBOYxsQetvuoF4JUSSy/BYdZlB+p4HMjXmmRil161W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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