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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6edc43fb415d617b1cfdcf1a988fbcfd0df67f34eb02039e3399341505b63a' 
  AND token = 'Hj0FyNZhFvkjH26gj+cHSqDoRdMGjR53dwgmJVr1WFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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