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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198ca36da85fb59c58f12432586f46205b61dd59a78f430287f2155fba7d972f' 
  AND token = '0CEFUzcSE6+9uA0LjZUjOyayim7vSEGK3+pGO1/cCsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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