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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1371d047aa749faa4f7f5defb619353735f1047ec44402bc14eee7e07e7deaf4' 
  AND token = '34NYuMQYDvQJ2QVS23RC/92jN4E5sZ58zIzMjCe8UEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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