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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78c64c60cd7bf4cad8a95cc7e2c0016ec8b6133f827f1303f347977ea42dad0' 
  AND token = 'IUBv0ie7LrlG55/wcAyAJfCuVtFIopAxW7h6m70chSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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