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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc36b97ced2a0a6ccc1c9937b4529ac59b1f1090a270849b6d2f03fb2947f016' 
  AND token = 'i7LOTt8hhbcNq3ajaF8mRenH5rUoofrEtAwTUnUtbDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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