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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb117a54cf121b0993575e62c48bb4e03730486fda7d7dd541b22a6b0117b687' 
  AND token = 'QVeVO1JhJ8ztnnETrRxH/Q9h6vNzhEDOymKHbPj9CM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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