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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c239ace3762bdd1730633127c8903372607dfd06317954c770701c3beeef91ca' 
  AND token = '89P4s4JUywSWAHl1nRzEh6fm1geSwu2OLTi0ME7aBE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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