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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4029c566cf146f83b6986bfc1a7605d4e4265596bf2b9359ece70639543f83' 
  AND token = '5PndergzU9A3x0GwfW5BoWdpNMcwU6ZNWVrwLmw/h6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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