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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33acf9bb1f07ee3bf05f3234b029143d71b701cb87126dc98635f67a4007b037' 
  AND token = 'f1podWtvKg97+iwdVmSbOrdwiw5Q7YWisoSpKxV4eQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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