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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b44fce47c92c91cf3b49db0da0947bd4d8b07643458e56e880afafe1a1ed7f' 
  AND token = 'A/AANzoZWODRA8F+EovbYJGccsu34HoNoNopyEd/hHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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