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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979f1b7a56df5b4f3689e0d3450b56ef95e5d7a5d16bce0615f3d6a630723248' 
  AND token = 'V10s4XFbHFXocrHWLk2P5cDuQ2SCSm+P9KnQ/TD8mrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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