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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59516d991645b776a52d6c64e9aa3d08ea54c3f8f1a1ea2ab9e84980c922e894' 
  AND token = 'NNAk9KIJkt+xNDymoECOR2gfKxslgxRrV04JV/s4U14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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