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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da13f3898998702227fb991e7989689e1efa8bf5b8b89d9fed1f9843e021f65d' 
  AND token = 'ulZW8wf0VK2VJi4xtiujQcMW5M6xdajYjay9Xr3rebs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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