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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3675fdd1df67df65c1f46d6e4ecea856c1e559fe4137b7909e070633dfb254ba' 
  AND token = 'aRjQlOYEztxszIPCjl8EQ7PaR5sZI+kO2XXX7Mx+7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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