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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b44fd907c1a6a14fbc9bb4f2bd8b34171e74b4053f517e0a4b3a33d17ad846a' 
  AND token = 'Rba0Y/witzb2FmC4/6jfRsHOAjYx7mquWuVrTZ9pUGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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