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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13986b3ce34c8fbe18b18ad4c5a3d130fc44da856c7462883b00da9aa2581d61' 
  AND token = 'JunHzZtE37+gvOknVEqlu2IBFNxizFltzJH47YWMvyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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