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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbb3c661cf4aa4470167109217e86c428d512f293d966c6dc082ea7e03f71b3' 
  AND token = 'prHDpi8VwUVdoX+uxYKVXOIsp6X+cO2iap/csnwmZGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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