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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd360a4d175091747e84557429796925c8af62ef9dafa4a086e041c56b5513e62' 
  AND token = '4uqs5EZDyjQG7LhVcyAj5ME1DrMt1/rNQk9QVXlBb5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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