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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a3fff3ab184ea3f542a165cf8f0b15e249d7efa4e0e0ed48cb9dea0afadb9a' 
  AND token = 'w9nfVjUnhoejZ9Z7u+42x86f1xHInexpqQNvpLJTMU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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