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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb14309f962493cbdf9de92a5c6f32a948f898ca79c0e7a949b07ab83d07357b' 
  AND token = 'NsoI+fUSoE8oCE+89cL+avIvQ7WkPnDjj2WZpXgxwH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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