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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12b825df769be962be7dc3ce88f9a5b8621dd2ef2db6401e5ea6a9c1f580f93' 
  AND token = 'lvLSwN11OlMHSufuhc/o/873Ze46XGc+ETD4eQIikl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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