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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a410eb3be5a6d5c0fad8054adfd7c61b7c88912d75c54fdfe2852ff940e0c2a' 
  AND token = 'rmWun41rViN9mtgpb0Yu5gPzllg+U7RXULuxqdkWbkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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