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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4007533c323475e9a758172841925aafde265e262c2d4a781d45c5b2f824c8ef' 
  AND token = '2QB10ilpU1oyc1RwcYgijYzvz+/TSM/Ut+g095qFFg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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