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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdad831d7fb367aeb037707040abaf86ae3dc6f44cf2c30bd3e5b9f529513343' 
  AND token = 'ODX/lb/Mj0BKAL7b/vgikZAttNyEy5j+FQ3UubXcYXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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