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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da06541ffe4bc08c232395adb5b60d67da4a4e4a9f0ff69ce3402712fdf69f59' 
  AND token = 'zh5xAcitY4mn/+8PTuiERvbZHVydLaA4NNa+2GMzazg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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