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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ff73c8525c2af32f7ac0c01b81a5f5935ce41cc9cc6e9e7f5666345499da84' 
  AND token = 'jkba1pQRrTFdRn21J0WRYwcsKKq/+5bt+oC3rqh1444=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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