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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2923361bf9ca606b3b41a0c9f64c9fdb5c8934e21c4c378d34b3972539ce87a1' 
  AND token = '24efrfZNhj5BosolaxXWgQ4VC/B+omYCVhc/D0AWAyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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