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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656f6465a672a4e38c022b72b3a5678c2632ec03ea54e79790b1fde4a8df848a' 
  AND token = 'sup81tcgLwFH79qoat0Cm3dG6LjleyHBZl0TL5CZlOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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