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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3d93c96b9845049f086ff0ee504745e4a92a7f6a14e399064964a9c98186fc' 
  AND token = 'Lmw7cpjc2k5lfPel9exzbzB8UwgS/+I11PgxGXnkZmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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