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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b3c3fd69692578f2edb01f124c04e2ed2e6e78116daeb82f51726cb0d6e5b3' 
  AND token = 'soPY4O1xKWKf1y+ycbHsNHLs6rmXOPwv9in0hrdAOq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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