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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833120104c891f9963da0077baf8096338f4459649ddb0642022c09389ac0213' 
  AND token = '9xvY69TBdwPv5GDseWQZPXiU5VTzpWyHURds15M1fxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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