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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c576a45a96a892399e847ef612f672413f946fe5e40921cb017e775d959d36' 
  AND token = '6D0aqbY5fpnsaqTlFRg//uw0xtsvWxq2CYGMGR67lP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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