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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b128ee94f1546862d85ad078e04330a7022728afd0d1c9361414908db37f5eb5' 
  AND token = '262LegvtMfmYbxaC6ghAM5A+CZtjQw67N8gB6KKrjUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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