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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c01c8c4688750b2d51b4997a282b0938b7c549e13efd497e3899680cd81b71f' 
  AND token = 'kXoNKMXda++786dlZdD4VO89PXuLakF4/6FDcfoLfO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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