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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bda3b6b951e9fd958d3150861ee5aa1657010d4a060a6365fc69fd227efafbb' 
  AND token = 'xBQ2vP4kWWPr51cUuBw9Tq0Jqv9JNfA+u7G5G47g0xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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