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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b30c9f1383aaba1a9f76b970d4e65d3fbf65032053a305195c6177df0a8e82' 
  AND token = 'navDl7HKFbq3Obj4LNNgZ9MPVIjQW6rwRCAvpecTFIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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