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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42aa1ec88a031df4d405e59a9adbe2aa60171c0577f1a699bc61b24a40078e1d' 
  AND token = '+AFl1R/h5cJ3MiDQya/GbjnNbFSWwplXNvyEi6TU324=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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