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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e6cee3cf53c29c6228f3da3dcb187681aba5544ca5946602dc9a0c88525e7d' 
  AND token = 'IxZ6bkZhYmt2bD60lR25KQ6hpXuByU/5YHDs+pHPDRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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