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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77a50acbcd961024590d6f25ac143990d44ff56ef96b323c3c03b4afb3ba3fd' 
  AND token = 'pz/WU5K3dc+Hp/vaWl09SoQviKnTmWjylmZJSoSERUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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