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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528f8c2a965ec85105638221be3f71d6d36b3297a2d981eb2632db9135c7e2b3' 
  AND token = 'j9huzIHATbBX1AgLkgQ05YFWZx3UtLtdFaK7Hvx86HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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