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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999788146f8f5eec9467a1508a6ea73f235926ad5bd242b7e8b4df0ca1be7aaa' 
  AND token = 'eoRy9q15QP5rbhfQdTXLu63g/6ZAfGmB4Ihen2OVi48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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