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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b930f32ab11e7a6097ab6b4a9b8ccfc94e510c02a825fc3218f8293b12dea45c' 
  AND token = '0oNQSftEo1gQe2ZXWgV75vSzIYPK9mOSn5DVPC+rfRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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