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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2e4bc1dd03911b4d77cd9509de4a5116f0fc077209f1d60dbf0ab774817e01' 
  AND token = '+jPgNbJGla0iFQ7qFxyxhB8if9qGUOJKY+M1+LXc9t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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