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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41214b4d94df1c2a2a690839b17128bc31e1e8a62cda2b50a9ee57567dc696b0' 
  AND token = 'hxZ+37hHKQqirTwntyCH7vgb1CZDDAeoR8jia+EwWng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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